If Regina didn’t cast the curse, then theoretically any character who died in Storybrooke isn’t dead. So Graham, Pan, Felix, Johanna, and Ingrid are all still alive.
Pan and Felix would still be in NVL and Ingrid in Arendelle but yes to the others. However, I’d really rather NOT have a giant reunion episode. They had their chance with that in the Underworld; bringing back long dead characters again just because “now plot twist!” is…lame. Especially when the characters will be gone once more when the “new plot twist!” is untwisted
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"He was a lot of things to me" "The only conclusion was love"